Update README.md

Author: Samuel Sebastian Schulze

README.md

@@ -2,3 +2,10 @@
 Manage your flatpaks - you can remove them, delete old configuration, remove unused flatpaks and more.
 
 ![Screenshot](screenshot.png)
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+## What can the application do?
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+- You can delete the configuration and application-data from removed flatpaks
+- You can uninstall all the flatpaks you don't need anymore (= dependencies for uninstalled flatpaks)
+- You can remove all the installed flatpaks.